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net_sched: convert tcf_exts from list to pointer array

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As pointed out by Jamal, an action could be shared by
multiple filters, so we can't use list to chain them
any more after we get rid of the original tc_action.
Instead, we could just save pointers to these actions
in tcf_exts, since they are refcount'ed, so convert
the list to an array of pointers.

The "ugly" part is the action API still accepts list
as a parameter, I just introduce a helper function to
convert the array of pointers to a list, instead of
relying on the C99 feature to iterate the array.

Fixes: a85a970af2 ("net_sched: move tc_action into tcf_common")
Reported-by: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2016-08-13 22:35:00 -07:00 committed by David S. Miller
parent 2734437ef3
commit 22dc13c837
7 changed files with 85 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -8396,12 +8396,14 @@ static int parse_tc_actions(struct ixgbe_adapter *adapter,
struct tcf_exts *exts, u64 *action, u8 *queue)
{
const struct tc_action *a;
LIST_HEAD(actions);
int err;
if (tc_no_actions(exts))
return -EINVAL;
tc_for_each_action(a, exts) {
tcf_exts_to_list(exts, &actions);
list_for_each_entry(a, &actions, list) {
/* Drop action */
if (is_tcf_gact_shot(a)) {

12
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
View File

@ -318,6 +318,7 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
u32 *action, u32 *flow_tag)
{
const struct tc_action *a;
LIST_HEAD(actions);
if (tc_no_actions(exts))
return -EINVAL;
@ -325,7 +326,8 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
*flow_tag = MLX5_FS_DEFAULT_FLOW_TAG;
*action = 0;
tc_for_each_action(a, exts) {
tcf_exts_to_list(exts, &actions);
list_for_each_entry(a, &actions, list) {
/* Only support a single action per rule */
if (*action)
return -EINVAL;
@ -362,13 +364,15 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
u32 *action, u32 *dest_vport)
{
const struct tc_action *a;
LIST_HEAD(actions);
if (tc_no_actions(exts))
return -EINVAL;
*action = 0;
tc_for_each_action(a, exts) {
tcf_exts_to_list(exts, &actions);
list_for_each_entry(a, &actions, list) {
/* Only support a single action per rule */
if (*action)
return -EINVAL;
@ -503,6 +507,7 @@ int mlx5e_stats_flower(struct mlx5e_priv *priv,
struct mlx5e_tc_flow *flow;
struct tc_action *a;
struct mlx5_fc *counter;
LIST_HEAD(actions);
u64 bytes;
u64 packets;
u64 lastuse;
@ -518,7 +523,8 @@ int mlx5e_stats_flower(struct mlx5e_priv *priv,
mlx5_fc_query_cached(counter, &bytes, &packets, &lastuse);
tc_for_each_action(a, f->exts)
tcf_exts_to_list(f->exts, &actions);
list_for_each_entry(a, &actions, list)
tcf_action_stats_update(a, bytes, packets, lastuse);
return 0;

4
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -1121,6 +1121,7 @@ static int mlxsw_sp_port_add_cls_matchall(struct mlxsw_sp_port *mlxsw_sp_port,
bool ingress)
{
const struct tc_action *a;
LIST_HEAD(actions);
int err;
if (!tc_single_action(cls->exts)) {
@ -1128,7 +1129,8 @@ static int mlxsw_sp_port_add_cls_matchall(struct mlxsw_sp_port *mlxsw_sp_port,
return -ENOTSUPP;
}
tc_for_each_action(a, cls->exts) {
tcf_exts_to_list(cls->exts, &actions);
list_for_each_entry(a, &actions, list) {
if (!is_tcf_mirred_mirror(a) || protocol != htons(ETH_P_ALL))
return -ENOTSUPP;

4
include/net/act_api.h
View File

@ -176,8 +176,8 @@ int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
int tcf_unregister_action(struct tc_action_ops *a,
struct pernet_operations *ops);
int tcf_action_destroy(struct list_head *actions, int bind);
int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
struct tcf_result *res);
int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
int nr_actions, struct tcf_result *res);
int tcf_action_init(struct net *net, struct nlattr *nla,
struct nlattr *est, char *n, int ovr,
int bind, struct list_head *);

40
include/net/pkt_cls.h
View File

@ -59,7 +59,8 @@ tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
struct tcf_exts {
#ifdef CONFIG_NET_CLS_ACT
__u32 type; /* for backward compat(TCA_OLD_COMPAT) */
struct list_head actions;
int nr_actions;
struct tc_action **actions;
#endif
/* Map to export classifier specific extension TLV types to the
* generic extensions API. Unsupported extensions must be set to 0.
@ -72,7 +73,10 @@ static inline void tcf_exts_init(struct tcf_exts *exts, int action, int police)
{
#ifdef CONFIG_NET_CLS_ACT
exts->type = 0;
INIT_LIST_HEAD(&exts->actions);
exts->nr_actions = 0;
exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
GFP_KERNEL);
WARN_ON(!exts->actions); /* TODO: propagate the error to callers */
#endif
exts->action = action;
exts->police = police;
@ -89,7 +93,7 @@ static inline int
tcf_exts_is_predicative(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
return !list_empty(&exts->actions);
return exts->nr_actions;
#else
return 0;
#endif
@ -108,6 +112,20 @@ tcf_exts_is_available(struct tcf_exts *exts)
return tcf_exts_is_predicative(exts);
}
static inline void tcf_exts_to_list(const struct tcf_exts *exts,
struct list_head *actions)
{
#ifdef CONFIG_NET_CLS_ACT
int i;
for (i = 0; i < exts->nr_actions; i++) {
struct tc_action *a = exts->actions[i];
list_add(&a->list, actions);
}
#endif
}
/**
* tcf_exts_exec - execute tc filter extensions
* @skb: socket buffer
@ -124,27 +142,21 @@ tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
struct tcf_result *res)
{
#ifdef CONFIG_NET_CLS_ACT
if (!list_empty(&exts->actions))
return tcf_action_exec(skb, &exts->actions, res);
if (exts->nr_actions)
return tcf_action_exec(skb, exts->actions, exts->nr_actions,
res);
#endif
return 0;
}
#ifdef CONFIG_NET_CLS_ACT
#define tc_no_actions(_exts) \
(list_empty(&(_exts)->actions))
#define tc_for_each_action(_a, _exts) \
list_for_each_entry(_a, &(_exts)->actions, list)
#define tc_single_action(_exts) \
(list_is_singular(&(_exts)->actions))
#define tc_no_actions(_exts) ((_exts)->nr_actions == 0)
#define tc_single_action(_exts) ((_exts)->nr_actions == 1)
#else /* CONFIG_NET_CLS_ACT */
#define tc_no_actions(_exts) true
#define tc_for_each_action(_a, _exts) while ((void)(_a), 0)
#define tc_single_action(_exts) false
#endif /* CONFIG_NET_CLS_ACT */

11
net/sched/act_api.c
View File

@ -420,18 +420,19 @@ static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
return res;
}
int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
struct tcf_result *res)
int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
int nr_actions, struct tcf_result *res)
{
const struct tc_action *a;
int ret = -1;
int ret = -1, i;
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
ret = TC_ACT_OK;
goto exec_done;
}
list_for_each_entry(a, actions, list) {
for (i = 0; i < nr_actions; i++) {
const struct tc_action *a = actions[i];
repeat:
ret = a->ops->act(skb, a, res);
if (ret == TC_ACT_REPEAT)

51
net/sched/cls_api.c
View File

@ -541,8 +541,12 @@ out:
void tcf_exts_destroy(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
tcf_action_destroy(&exts->actions, TCA_ACT_UNBIND);
INIT_LIST_HEAD(&exts->actions);
LIST_HEAD(actions);
tcf_exts_to_list(exts, &actions);
tcf_action_destroy(&actions, TCA_ACT_UNBIND);
kfree(exts->actions);
exts->nr_actions = 0;
#endif
}
EXPORT_SYMBOL(tcf_exts_destroy);
@ -554,7 +558,6 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
{
struct tc_action *act;
INIT_LIST_HEAD(&exts->actions);
if (exts->police && tb[exts->police]) {
act = tcf_action_init_1(net, tb[exts->police], rate_tlv,
"police", ovr,
@ -563,14 +566,20 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
return PTR_ERR(act);
act->type = exts->type = TCA_OLD_COMPAT;
list_add(&act->list, &exts->actions);
exts->actions[0] = act;
exts->nr_actions = 1;
} else if (exts->action && tb[exts->action]) {
int err;
LIST_HEAD(actions);
int err, i = 0;
err = tcf_action_init(net, tb[exts->action], rate_tlv,
NULL, ovr,
TCA_ACT_BIND, &exts->actions);
TCA_ACT_BIND, &actions);
if (err)
return err;
list_for_each_entry(act, &actions, list)
exts->actions[i++] = act;
exts->nr_actions = i;
}
}
#else
@ -587,37 +596,49 @@ void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
struct tcf_exts *src)
{
#ifdef CONFIG_NET_CLS_ACT
LIST_HEAD(tmp);
struct tcf_exts old = *dst;
tcf_tree_lock(tp);
list_splice_init(&dst->actions, &tmp);
list_splice(&src->actions, &dst->actions);
dst->nr_actions = src->nr_actions;
dst->actions = src->actions;
dst->type = src->type;
tcf_tree_unlock(tp);
tcf_action_destroy(&tmp, TCA_ACT_UNBIND);
tcf_exts_destroy(&old);
#endif
}
EXPORT_SYMBOL(tcf_exts_change);
#define tcf_exts_first_act(ext) \
list_first_entry_or_null(&(exts)->actions, \
struct tc_action, list)
#ifdef CONFIG_NET_CLS_ACT
static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
{
if (exts->nr_actions == 0)
return NULL;
else
return exts->actions[0];
}
#endif
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
struct nlattr *nest;
if (exts->action && !list_empty(&exts->actions)) {
if (exts->action && exts->nr_actions) {
/*
* again for backward compatible mode - we want
* to work with both old and new modes of entering
* tc data even if iproute2 was newer - jhs
*/
if (exts->type != TCA_OLD_COMPAT) {
LIST_HEAD(actions);
nest = nla_nest_start(skb, exts->action);
if (nest == NULL)
goto nla_put_failure;
if (tcf_action_dump(skb, &exts->actions, 0, 0) < 0)
tcf_exts_to_list(exts, &actions);
if (tcf_action_dump(skb, &actions, 0, 0) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
} else if (exts->police) {